Pre this patch the HA broker removed its own address from the set of cluster
addresses to form the set of failover addresses. The goal was avoid useless
self-connection attempts. However this was broken with a Virtual IP address
where a single address is used for the entire cluster.

The remove-self is not essential, self-connection attempts are prevented
elsewhere. Backup brokers will be prevented from connecting to self by the same
connection-observer as normal clients, and this patch addes self-connection
checks ins

This patch
- removes the code to remove self-addresses
- adds self-connection checks in ConnectionObserver
- adds & reorders some log statements & comments for greater clarity.

git-svn-id: https://svn.apache.org/repos/asf/qpid/branches/0.18@1370308 13f79535-47bb-0310-9956-ffa450edef68

Set alternate exchange on replicated queues and exchanges.  If the exchange is
available, set it immediately. Otherwise remember what needs to be set so it can
be set when the exchange becomes available.

git-svn-id: https://svn.apache.org/repos/asf/qpid/branches/0.18@1366206 13f79535-47bb-0310-9956-ffa450edef68

Fix test_failover_send_receive showing missing messages. With this fix,
ran with -DDURATION=2 overnight with no failures.

- Primary, RemoteBackup: Only report "ready" once per remote backup.
- HaBroker: Put membership updates under mutex.
- ReplicatingSubscription: Check for backup missing messages at the front.
- ha_tests.py: Added assertion to test_priority_ring, verify primary queue as expected.

git-svn-id: https://svn.apache.org/repos/asf/qpid/branches/0.18@1366180 13f79535-47bb-0310-9956-ffa450edef68

- Demote timed-out backups from ready to catch-up.
- Don't cancel connected backups on timeout, only disconnected ones.
- Don't allow promotion of a catch-up broker.
- Minor logging improvement.

git-svn-id: https://svn.apache.org/repos/asf/qpid/branches/0.18@1363487 13f79535-47bb-0310-9956-ffa450edef68

Caused by a test bug, default timeout was too short.
Fixed the test to set a high timeout and increased default timeout.

git-svn-id: https://svn.apache.org/repos/asf/qpid/branches/0.18@1362654 13f79535-47bb-0310-9956-ffa450edef68

After a failure, the newly-promoted primary broker guards messages for each of
the backups that were connected at the time of the failure. It waits for them to
reconnect to the new primary before becoming active.

This patch introduces a time-out so that if an expected backup fails to
fail-over within the time limit, the primary will cancel the guards for that
backup and carry on.

git-svn-id: https://svn.apache.org/repos/asf/qpid/branches/0.18@1360348 13f79535-47bb-0310-9956-ffa450edef68

- Updated test framework to use credentials
- Updated BrokerReplicator to use HA identity to create configuration
- Updated documentation with a HA security section.
- Updated qpid-ha to take --sasl-mechanism

git-svn-id: https://svn.apache.org/repos/asf/qpid/branches/0.18@1360227 13f79535-47bb-0310-9956-ffa450edef68

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1358321 13f79535-47bb-0310-9956-ffa450edef68

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1357850 13f79535-47bb-0310-9956-ffa450edef68

- The qpid code deliberately won't use IPv6 unless it has IPv6 configured
  on the machine, if it's not fully there don't try to test it.

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1356946 13f79535-47bb-0310-9956-ffa450edef68